Near-fault seismic hazard effects on embankment dam response: sensitivity analysis of the Geyve Doğantepe Dam
Geomatics, Natural Hazards and Risk, cilt.17, sa.1, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 17 Sayı: 1
- Basım Tarihi: 2026
- Doi Numarası: 10.1080/19475705.2026.2711488
- Dergi Adı: Geomatics, Natural Hazards and Risk
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, CAB Abstracts, Compendex, Environment Index, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Natural Science Collection (ProQuest), Biological Science Database (ProQuest), Earth, Atmospheric, & Aquatic Science Collection (ProQuest), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: embankment dam, Near-fault ground motion, sensitivity analysis, small-strain stiffness, time-history analysis
- Eskişehir Osmangazi Üniversitesi Adresli: Evet
Özet
This study investigates the seismic safety of the Geyve Doğantepe Dam, located approximately 700 m from the active Geyve Fault on the middle branch of the North Anatolian Fault Zone. Embankment dams in near-fault regions are exposed to strong ground motions, yet the combined effects of frequency content, material stiffness, and reservoir conditions remain insufficiently understood. To address this gap, nonlinear dynamic time-history analyses based on the finite element method were conducted using scaled records from the 1999 Kocaeli earthquake. The results show that the seismic response is concentrated within the short-period range (T ≈ 0.15–0.30 s), with peak spectral accelerations of 1.8–2.2 g at T ≈ 0.2 s. Maximum crest displacements range from ±0.10 to ±0.14 m, corresponding to amplification factors of 1.8–2.2 relative to bedrock motion. Sensitivity analyses reveal that stiffness-related parameters primarily control the seismic response, with the small-strain shear modulus having the greatest influence, followed by secant stiffness, while the effective internal friction angle has a smaller effect. Reservoir conditions reduce displacement demands by 10–20% due to hydrodynamic added-mass effects, emphasizing the importance of integrating period-dependent spectral evaluation, nonlinear time-history analysis, and parameter sensitivity analysis for reliable seismic assessment of near-fault embankment dams.